Front fender emblems are the same for both the C&K series - at least for 82-84.
P/N = 14051852
These will certainly be available only from a private sale or on ebay. They were discontinued by GM years ago. So, like 87 GMC Jimmy suggests, if you require NOS, you are going to pay a premium price. Here is a set that sold in September...for $242:
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Item condition:New other (see details)
Ended: Sep 12, 2016 , 12:51PM
Winning bid:US $242.50
[ 10 bids ]
Used:
Here's a set that looks pretty good (no pins, but nice finish). They're listed as "buy it now" for $110. But he'll take offers - I'll bet you can get them for $90:
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http://www.ebay.com/itm/1981-88-CHE...755548?hash=item43f9dc07dc:g:ugcAAOSwiDFYOgNO
This guy is selling two sets.
http://www.ebay.com/itm/1981-88-CHE...447de61&pid=100011&rk=3&rkt=5&sd=252163631249
One for $89:
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And one for $79:
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There were some reproduction emblems being sold for a while (they went for about $300 - 350). They were nice looking enough and you got a 3 emblem set - 2 big ones for the fenders and a small one for the dash:
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but who knows how long they'd stay looking that way. Up till about a year ago, these were readily available on the internet. Then, for some reason, they pretty much disappeared. I would imagine that GM took legal action and had - whatever outfit was making them - shut down over licensing rights. They were pretty cocky about what they were doing. They even were using GM's original part numbers as their own:
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One other source is the junkyards. Go to a few big ones and just walk around looking. These trucks have been pretty much stripped of the good stuff, but you never know.